Meinberg LANTIME, Operating Instructions Manual

Page: 149 / 153

Outputs
The module GPS167-TC provides modulated and unmodulated (DC-Level Shift)
outputs. The format of the timecodes is illustrated in the diagramms "IRIG-" and
"AFNOR standard-format".
AM - Sine Wave Output
The amplitude-modulated carrier is available at the VG-connector pin 14a. The
carrier frequency depends on the code and has a value of 1 kHz (IRIG-B). The signal
amplitude is 3 V
pp
(MARK) and 1 V
pp
(SPACE) into 50
Ω
. The encoding is made by
the number of MARK-amplitudes during ten carrier waves. The following agreements
are valid:
a) binary "0": 2 MARK-amplitudes, 8 SPACE-amplitudes
b) binary "1": 5 MARK-amplitudes, 5 SPACE-amplitudes
c) position-identifier: 8 MARK-amplitudes, 2 SPACE-amplitudes
PWM DC Output
The pulse width modulated DC signals shown in the diagramms "IRIG" and
"AFNOR standard format" are coexistent to the modulated output and is available at
the VG connector pin 13a with TTL level.
Technical Data
OUTPUTS: Unbalanced AM-sine wave-signal:
3 V
PP
(MARK) / 1 V
PP
(SPACE) into 50
Ω
PWM signal: TTL, high and low active
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